Meaning of VERNIER in English

VERNIER

or vernier caliper

Instrument for making very accurate linear or angular measurements.

Introduced in 1631 by Pierre Vernier (с 1580–1637), it uses two graduated scales: a main scale similar to that on a ruler, and a specially graduated scale, the vernier, that slides parallel to the main scale and enables readings to be made to a fraction of a division on the main scale.

Britannica English dictionary.      Английский словарь Британика.